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M2 wave buoy daily means for Mar 2012

Daily means from the M2 wave buoy for Mar 2012, including available wave height, period, direction, wind and sea temperature data.

Last observation shown

Data available:  to 

Monthly means for

Latest

Period Summary

Programmatically generated summary. Hog Says

732 wave-buoy observations covered all 31 days. Typical wave height was 2.6 ft (10th–90th percentile 2.1–4.6 ft), while mean peak wave period was 5.7 seconds (10th–90th percentile 3.5–9.5 seconds). Typical wind was 10.5 mph (10th–90th percentile 3.6–19.9 mph) and mean water temperature was 8.4°C (10th–90th percentile 8.2–8.7°C). 10 of 3,697 checked values (0.3%) were excluded by quality control. Across 2 comparable years, mean wave height was above the same-month mean of 2.7 ft and mean wave period was above the same-month mean of 4.7 seconds.

Generated only from the observations and comparisons shown on this page.

Typical Significant Wave Height

2.6ft
Mean: 3 ft
P10–P90: 2.1 — 4.6 ft
Recorded extremes

1.5 — 5.6 ft

Available for 37 of 732 hourly samples

Mean Observed Wave Period

5.7secs
P10–P90: 3.5 — 9.5secs
Recorded extremes

2.3 — 14.6secs

Available for 722 of 732 hourly samples

Typical Observed Wind

Variable, 10.5mph
Mean: 11.3 mph
P10–P90: 3.6 — 19.9 mph
Recorded extremes

0.3 — 30 mph

Circular concentration: 25%

Mean Water Temperature

8.4°C
P10–P90: 8.2 — 8.7°C
Recorded extremes

8.1 — 9.6°C

Compared With Previous Marchs

Historical baseline from 1,457 observations across 2 years.

Wave Height
3ft
0.3ft above mean
Historical mean 2.723ft
Wave Period
5.7s
1s above mean
Historical mean 4.7s
Water Temperature
8.4°C
0.3°C above mean
Historical mean 8.1°C

Chart showing grouped wave observations for M2. Use the table on this page for a text version of the same measurements. To open hourly observations, use a linked day name in the table.

About M2 wave buoy

M2 (WMO 62091) is part of the Irish Marine Data Buoy Observation Network, managed by the Marine Institute in collaboration with Met Éireann. Moored in the Irish Sea east of Ireland, it provides open-water context for the busy, relatively enclosed waters between the Irish and British coasts.

Its current data source reports wave height, wave period, wave direction, directional spread, wind conditions and sea temperature.

Metrics are rows; days run left to right.
M2 wave buoy daily means Mar 2012Last observation shown
Metric
Mean significant wave height (ft)-----------------------------33
Mean maximum wave height (ft)-----------------------------45
Mean peak period (s)54655665556775465545555811997555
Mean zero-crossing period (s)-----------------------------44
Mean peak wave directionSconcentration 95%Sconcentration 94%Sconcentration 95%WNWconcentration 69%NWconcentration 71%SSWconcentration 66%WSWconcentration 61%SWconcentration 80%Sconcentration 92%SSWconcentration 70%Variableconcentration 23%Sconcentration 63%SSEconcentration 55%Sconcentration 76%Sconcentration 88%Sconcentration 96%Sconcentration 78%NNEconcentration 68%SWconcentration 71%Sconcentration 93%Sconcentration 83%ENEconcentration 87%ENEconcentration 70%Sconcentration 82%Sconcentration 89%SSEconcentration 86%Sconcentration 63%SSEconcentration 59%Nconcentration 43%Nconcentration 98%Nconcentration 97%
Mean wave directionSconcentration 96%Sconcentration 96%Sconcentration 97%Wconcentration 80%NWconcentration 69%Sconcentration 60%WSWconcentration 73%SSWconcentration 86%Sconcentration 97%SSWconcentration 97%SSWconcentration 77%SSEconcentration 78%SSEconcentration 76%Sconcentration 83%SSWconcentration 94%Sconcentration 97%Sconcentration 89%NNEconcentration 78%SWconcentration 76%Sconcentration 97%Sconcentration 94%Econcentration 90%ESEconcentration 76%SSEconcentration 86%SSEconcentration 93%SSEconcentration 87%SSEconcentration 81%SSEconcentration 87%Nconcentration 51%Nconcentration 99%Nconcentration 97%
Mean directional spread (°)22.924.621.826.030.430.625.531.327.739.149.750.346.734.024.520.231.629.325.826.738.926.637.444.441.333.637.737.629.722.621.5
Mean wind directionSSWconcentration 99%Sconcentration 94%SSWconcentration 81%NWconcentration 99%WNWconcentration 95%SSWconcentration 93%Wconcentration 87%SWconcentration 85%SWconcentration 92%WSWconcentration 96%Wconcentration 66%SSEconcentration 48%SEconcentration 78%Sconcentration 91%SSWconcentration 96%SSWconcentration 91%ENEconcentration 31%NNWconcentration 69%WSWconcentration 88%SSWconcentration 96%Sconcentration 82%Econcentration 94%SEconcentration 78%ESEconcentration 95%ESEconcentration 73%ENEconcentration 89%NEconcentration 82%NWconcentration 76%Nconcentration 85%NNWconcentration 94%Nconcentration 93%
Mean wind speed (mph)1513151914192317141074511141781315138147964338913
Mean water temperature(°C)8.58.58.58.38.28.28.28.18.28.28.28.28.28.28.28.28.38.38.38.48.38.38.38.48.58.68.88.88.78.78.7

Swipe sideways to see more days.

Wave metric colour key

Colours move through the scale as each number increases. They do not by themselves mean that conditions are good, safe or suitable for you.

Wave & swell height0–40+ ft
Wave & swell period0–22+ s
Wind speed0–75 mph

The displayed numbers remain the source of truth; colour is an additional visual cue.

What does buoy wave power mean?

kW/m means kilowatts of wave power per metre of wave crest. It describes the rate at which the observed sea state carries energy past the buoy.

Unlike the shore-directed forecast value, buoy wave power is the total power at the observation point. It is not projected towards a particular beach and does not predict breaking wave height.

In deep water, wave power can be calculated with:

P is approximately 0.49 times significant wave height squared times wave energy period.

P is power in kW/m, Hs is significant wave height in metres, and Te is wave energy period in seconds.

  • Provider-reported power is used when available.
  • Otherwise, a value is calculated only when both significant height and a genuine energy period are available. The ≈ symbol marks calculated values.
  • A dash is shown instead of substituting peak, Tm02, zero-crossing or other period measurements.
  • Daily and monthly figures use the mean of hourly-normalized observation power values; they are not calculated from mean height and period.

Wave direction, spectrum, water depth and local bathymetry still matter. Wave power is best read alongside height, period and direction rather than as a standalone surf-quality score.

Observation data source

Learn how SurfHog combines, checks and summarizes observations in the data and methodology notes.

› Wave Buoy List